This statement is based upon the Christian doctrine that Jesus was sent to Earth by God to take away the sins of the world, and was crucified, died, resurrected three days later and rose to heaven to be with God, his father (who is also himself).

Counter-apologetics

The way the story of Adam and Eve is written, God apparently created people knowing that they were likely to sin, and then engineered the circumstances in which they would commit sin. Is it reasonable to blame people for acting in the way that God created them?

Why a sacrifice at all? Surely if an omnipotent being did not want to eternally punish people, he would simply not eternally punish them. How exactly does God sacrificing himself to himself change the situation?

For an eternal being, dying for three days is not much of a sacrifice. Jesus was crucified by people who didn't agree with his contemporary blasphemy, knowing that he was a god, was taken off the cross just a few hours later, supposedly died, rose from the dead and is now in heaven. Plenty of people have suffered worse tortures throughout history, and have not gotten to become God in the bargain. Perhaps if Jesus had truly died and was suffering in hell right now and for the rest of eternity, that would be a real sacrifice for us.

Why wait so long? If Jesus truly is the only path to salvation, then people lived and died for thousands of years with no chance to escape hell.